Hi Kristie. Here's the part you'll need from the help doc:
Moz Local takes the time and hassle out of managing your listings across multiple sites and directories. When you submit a listing on Moz Local, it must match an existing Google Places or Facebook listing across all of the following attributes: Business Name, Address, Phone Number, and Website. Because you've already gone through the phone or postcard verification process with Google and/or Facebook, your Moz Local listings will be validated if they exactly match Google or Facebook.
Some of our partners—such as Infogroup and Best of the Web—may call or email to confirm your listing information is accurate, but no postcard or PIN entry is required.
It sounds like the account was created using Facebook as a match and you'll need to make sure that the Google Business listing you have matches that one exactly in the attributes listed above.